title: Association between total sleep duration and suicidal ideation among the Korean general adult population.
abstract: OBJECTIVE
  Examine the association between sleep duration and suicidal ideation in Korean adults.
  
  
  METHODS
  Cross-sectional survey.
  
  
  METHODS
  Data obtained by the Korea National Health and Nutrition Examination Survey IV (2007-2009) using a rolling sampling design involving a complex, stratified, multistage, and probability-cluster survey of civilian non-institutionalized Korean residents.
  
  
  METHODS
  A total of 15,236 subjects (6,638 males and 8,598 females) ≥ 19 years old.
  
  
  RESULTS
  The weighted prevalence of self-reported short sleep duration (≤ 5 h/day) was 11.7% in males and 15% in females, and of long sleep duration (≥ 9 h/day) was 6.7% in males and 8.9% in females. A U-shaped relationship existed, with both short and long sleep durations associated with a higher suicidal ideation risk. Multiple logistic regression analysis was used to analyze the relationship between sleep duration and suicidal ideation, adjusting for sociodemographic factors, health behavior, and health status. After controlling for covariates, people with short sleep were 38.1% more likely to have suicidal ideation (OR = 1.381, 95% CI 1.156-1.650) than people with sleep duration of 7 h/day. Suicidal ideation was 1.196 times higher (95% CI: 0.950-1.507) in long-sleeping people than people sleeping 7 h/day, although statistically not significant. Inclusion of depressive mood (a potential confounder) in multiple logistic regression models attenuated but did not eliminate the sleep duration/suicidal ideation association.
  
  
  CONCLUSIONS
  Sleep duration and suicidal ideation were assessed only by self-report.
  
  
  CONCLUSIONS
  The sleep duration/suicidal ideation relationship is U-shaped in the Korean adult population. Self-reported habitual sleep duration may be a useful behavioral indicator for both individual and societal suicidal ideation risk.
authors.affiliation: Department of Public Health, Yonsei Univeristy, Seoul, Korea ; Institute of Health Services Research, Yonsei Univeristy, Seoul, Korea.
authors.forename: Jae-Hyun
authors.initials: JH
authors.lastname: Kim
authors.forename: Eun-Cheol
authors.initials: EC
authors.lastname: Park
authors.forename: Woo-Hyun
authors.initials: WH
authors.lastname: Cho
authors.forename: Chong Yon
authors.initials: CY
authors.lastname: Park
authors.forename: Jong-Yeon
authors.initials: JY
authors.lastname: Park
authors.forename: Won-Jung
authors.initials: WJ
authors.lastname: Choi
authors.forename: Hoo-Sun
authors.initials: HS
authors.lastname: Chang
mesh_terms: D000328:Adult; D000367:Age Factors; D003430:Cross-Sectional Studies; D005260:Female; D006304:Health Status; D006306:Health Surveys; D006801:Humans; D016015:Logistic Models; D008297:Male; D056910:Republic of Korea / Q000453:epidemiology; D012307:Risk Factors; D012890:Sleep; D012893:Sleep Wake Disorders / Q000523:psychology; D012959:Socioeconomic Factors; D059020:Suicidal Ideation; D055815:Young Adult
keywords: Suicidal ideation; depressive symptom; gender; sleep